Photo taken on July 31, 2017 shows the opening ceremony of the 4th national military camp for students in Dalian, coastal city of northeast China's Liaoning Province. The opening ceremony of the 4th national military camp for students was held on the training ship "Qi Jiguang" at Lyushun naval port in Dalian on Monday. Over 300 teachers and students from across China attended the event to learn military theories and receive sail training. (Xinhua/Long Lei)